As a manager, you can navigate to the individual user's account and view it under "Recent Activity." Mailprotector stores activity logs for 2 years, and we report them under the "Overview" tab under each level in the console.
If the email has a "was delivered to *User*" message, then the email was successfully handed off to the inbound mail destination. If the email was not successfully delivered, there either won't be an activity for it or an error will be reported.
If you run into any unique situations, please reach out to Mailprotector by submitting a request or contacting us at 1-800-393-4840 X2.